For admission into the NPL and CPL you are voted in/chosen by the board/directors/whatever. USAMP votes/choses against other local teams. Such was the case of GPS girls not getting NPL.
Where are you getting this information from? While I am not a board member of the NPL I�m quite confident that USA didn�t prevent James Island from joining NPL. Keep in mind JIYSC falls under the GPS umbrella and GPS Carolina, as you�ve already stated, have a presence with US Club Soccer. GPS Girls not �getting� NPL this past year had zero to do with USA and everything to do with that girls team again being a challenge team.